- 摘 要
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(1 蘭州大學(xué)西部災(zāi)害與環(huán)境力學(xué)教育部重點實驗室， 蘭州 730000； 2 蘭州大學(xué)土木工程與力學(xué)學(xué)院， 蘭州 730000； 3 重慶大學(xué)土木工程學(xué)院， 重慶 400044)
［摘要］介紹了國內(nèi)外振動舒適度評價標(biāo)準(zhǔn)及評價指標(biāo)，結(jié)合大跨度樓蓋振動舒適度問題，指出預(yù)應(yīng)力混凝土剛架索梁樓蓋體系豎向振動頻率不小于3Hz，作為辦公室在落足激勵下豎向峰值加速度不大于0-5%g。通過SAP2000建立了預(yù)應(yīng)力混凝土剛架索梁樓蓋體系“桿單元-殼單元”三維計算模型，對該樓蓋振動舒適度進行了評價。該計算模型以Murray建立的落足模型為基礎(chǔ)，考慮了測試人員的實際體重，通過時程分析方法得到預(yù)應(yīng)力混凝土剛架索梁樓蓋體系在落足激勵下的峰值加速度時程響應(yīng)，并在此基礎(chǔ)上得到樓蓋豎向振動基本頻率，計算所得峰值加速度和基本頻率與試驗結(jié)果吻合良好。
［關(guān)鍵詞］大跨度； 預(yù)應(yīng)力混凝土剛架索梁； 樓蓋； 振動； 加速度時程
中圖分類號：TU378-8文獻標(biāo)識碼：A文章編號：1002-848X(2016)15-0001-04
Study on vibration serviceability of pre-stressed cable RC truss floor system
Zhou Xuhong1, 2, 3， Li Jiang1, 2， Liu Jiepeng3， Cao Liang3
(1 Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education of China, Lanzhou University, Lanzhou 730000, China； 2 School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China； 3 School of Civil Engineering, Chongqing University， Chongqing 400044, China)
Abstract:The vibration serviceability evaluation standards and evaluation indexes in literatures from home and abroad were introduced. Combined with large-span floor vibration serviceability problem, it was suggested that the vertical vibration frequency of pre-stressed cable RC truss floor system should not be less than 3Hz, and the vertical peak acceleration of an office should not be more than 0-5%g under the footfall excitation. By using SAP2000, three-dimensional calculation model of “beam-shell element” was established for the pre-stressed cable RC truss floor system, and the floor vibration serviceability was evaluated. The calculation model was based on Murray footfall model and took into account the actual weight of test personnel. Peak acceleration time history response of the pre-stressed cable RC truss floor system under the footfall excitation was obtained by the time history analysis method. There is a good agreement between the results of the fundamental frequency and peak acceleration from tests and time history analysis method.
Keywords:large-span; pre-stressed cable RC truss; floor; vibration; acceleration time history
*國家自然科學(xué)基金資助項目（51378244）。
通訊作者：李江，博士研究生，Email：lijiangest@126.com。
